# Newborn Physique vs ThirdCatheter

The clearest difference is in-app purchases: Newborn Physique at none against ThirdCatheter's 3. Newborn Physique also leads on price ($0.99 vs $1.99) and iOS requirement (17.0 vs 26.0). ThirdCatheter's advantage is review sentiment (100% vs 67%) and update cadence (every 5 days vs every 3 weeks). On ads and device support there is nothing between them.

Newborn Physique costs $0.99 and ThirdCatheter $1.99 up front. ThirdCatheter sells 3 in-app purchases, starting at $0.49 per month. Newborn Physique asks for nothing beyond the download.

Newborn Physique ships an update every 3 weeks, ThirdCatheter every 5 days. The most recent releases landed on October 8, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Newborn Physique | ThirdCatheter |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 28 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Twelve Axis](https://appshunter.io/developer/499162428) | [Masaaki Hirata](https://appshunter.io/developer/942972055) |

## What reviewers say

### Newborn Physique

[App page](https://appshunter.io/ios/app/newborn-physique/id499162425)

This application helps healthcare professionals quickly assess a newborn's physical development based on weight, height, and head circumference relative to gestational age. It calculates z-scores and percentiles, and identifies infants considered Small for Gestational Age (SGA). The app utilizes data from The Journal of the Japan Pediatric Society for its assessments.

**Highlights:** Assess newborn physique, Calculate z-scores and percentiles, Identify SGA infants, Utilizes pediatric society data, Customizable display options

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### ThirdCatheter

[App page](https://appshunter.io/ios/app/thirdcatheter/id1209823996)

This medical reference tool calculates the theoretical minimum diameter for guiding catheters when using three devices. It offers device data pre-installed in new versions and advanced features like net search and gap imaging evaluation in the paid version. Users are advised to consult device manuals for strategy planning.

**Highlights:** Minimum diameter calculation for guiding catheters, Pre-installed device data, Net search and gap imaging evaluation (paid), Device information sharing via AirDrop, Device data editing with CatheterEditor, Calculates space needed for device function

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Device Data Use | $0.49 | per month |
| 6 months Device Data Use | $1.99 | per 6 months |
| Fine-tune and save device info. | $1.99 | one-time |


## Frequently asked questions

### Is Newborn Physique free?

Newborn Physique costs $0.99, with no in-app purchases.

### Is ThirdCatheter free?

ThirdCatheter costs $1.99, and also offers in-app purchases.

### Do Newborn Physique or ThirdCatheter have ads?

Neither Newborn Physique nor ThirdCatheter shows ads.

### Which is updated more often, Newborn Physique or ThirdCatheter?

Newborn Physique ships an update every 3 weeks, and ThirdCatheter every 5 days. Most recently, Newborn Physique was updated on October 8, 2026 and ThirdCatheter on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*